Is it normal to have a large number of telemarketer calls and robocalls on a landline nowadays? And what can be done about this?

This is the first time I’ve had a landline in over a decade, and it is quickly growing unbearable. I usually get 2–7 of these calls per day, most asking for someone (the same person) I’ve never heard of. This number is on the Do Not Call registry and has been for over 30 days. I looked at NoMoRobo.com but it says my phone service can’t use it – and if I understand correctly, it wouldn’t stop living telemarketers anyway. Every call is from a different number and claim at least to be from different companies. I file FCC complaints on some of them – mostly on the live telemarketing ones where the person completely disregards my repeated and increasingly irate requests that they remove the number from their calling lists – but this is time consuming and obviously not a real solution.

Is this normal for landlines nowadays? Is there anything I can do, or do I have to just change my number?